Linked from
The 14 pages that link to Fossil calibration, each with the reason it gives.
Molecular clockRelated: Fossils can provide minimum or bounded ages for clock estimates.
FeliformiaRelated: Feliform divergence dates depend partly on how fossils are assigned to branches.
AiluridaeRelated: Ailurid fossils can constrain dates for branches within musteloid evolution.
MadtsoiidaeRelated: Madtsoiid fossils can affect estimates of when major snake lineages arose.